An expression for the surface energy at the normal-superconducting boundaries of a laminar intermediate state structure is derived as a function of a s /δ, where a s is the width of superconducting domains and δ the surface energy parameter. Numerical calculations show that the ratio δ/ξ (ξ is the coherence length) is almost constant for a s/δ larger than the limit of about 4. This value corresponds to the critical film thickness that separates the regions of type I and type II superconducting behavior.
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On leave from the Department of Physics, Faculty of Science, Kyushu University, Fukuoka, Japan.
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Miyazaki, T., Rinderer, L. Landau laminar intermediate state structures: Surface energy between normal and superconducting domains in type I superconductors with small κ values. J Low Temp Phys 71, 223–230 (1988). https://doi.org/10.1007/BF00118577
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DOI: https://doi.org/10.1007/BF00118577